SEMOpx Contact Details Cutover Weekend Available Saturday and Sunday from 09:00 to 17:00 for all general queries and non-urgent operational issues, and 24 hours a day for emergency operational issues relating to the Day Ahead and Intraday Market. Query Type* Available Email Phone* (applicable for all options) Urgent Day Ahead & Intraday Auction Trading (1) 24 hr marketops@ops.semopx.com Republic of Ireland: 1800 283 010 Northern Ireland: 0800 008 3010 International: +353 1 668 8183 Urgent Day Ahead & Intraday Continuous Trading (2) General SEMOpx Enquiries (3) 9-5 info@semopx.com *You will be prompted to select the relevant query type option 1-3 from the menu

Front Office Contact Details Cutover Weekend Available Saturday and Sunday from 09:00 to 17:00 for all general queries and non-urgent operational issues. *LCF Hotline/Email avail 24/7 Query Type* Available Email Phone* (applicable for all options) General Balancing Market Enquiries 9-5 info@sem-o.com Republic of Ireland: 1800 726 772 Northern Ireland: 08000 726 772 International: +353 1 237 0584 General Capacity Market Enquiries Formal Queries Market Operations Hotline (SEMO LCF Issues only) 24/7 LCF@sem-o.com +353 1 237 0744

Participant Calls – Saturday & Sunday Time Details Morning Participant 09:30 Conference Dial-in (ROI):  +353 (0)1 664 8888 Conference Dial-in (NI):  +44 (0)28 9595 0070 Participant Passcode:  894516 International Dial-in Numbers: Link Here. Lunch Participant 12:30 Evening Participant 16:30